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Question

If taster male and female in heterozygous form are crossed, the % of male tasters in progeny will be

A
18
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B
45
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C
0
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D
75
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Solution

The correct option is D 75
A taster individual has the ability to taste the chemical phenylthiocarbamide. The taster genotype is autosomal dominant while the inability to taste it is recessive. If a heterozygous taster woman (Tt) marries a heterozygous taster man (Tt), the % of taster progeny will be:
gametes Tt (mother)-->
Tt (father)
T t
T TT
taster
Tt
taster
t Tt
taster
tt
non-taster
Phenotypic ratio= 3 taster : 1 non taster
Therefore, they will have 75% taster progeny, irrespective of the sex of offspring as it is not sex-linked trait. Thus, '75' is the correct option.

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